The repeated meeting must be convened after the inquorate original, and the invitation, often already the first one, must state its time and that it will be quorate regardless of the ownership share present, provided owners were clearly informed in advance.
This rule solves the practical problem of a building being paralysed because part of the owners regularly stay away. Without it, valid decisions would be nearly impossible in a passive community.
An important limit is that only agenda items listed in the original invitation may be validly discussed at the repeated meeting. New topics cannot be slipped in on the grounds that decisions will be valid at lower turnout anyway.
In practice the repeated meeting is best scheduled close to but not immediately after the original, typically half an hour to an hour later, on the same day and at the same venue.
A common misunderstanding is that anything can be decided at a repeated meeting even with few present. In reality questions requiring a qualified majority still need the higher threshold.
Merbo states the time and conditions of the repeated meeting in every invitation, so an inquorate first attempt causes no extra delay in decision making.
Recurring inquoracy is itself a signal: if the required share never gathers year after year, it is worth examining what keeps owners away. A more flexible time or online participation often improves the situation on its own.